Apple buys fifty business class seats on United Airlines from San Francisco (SFO) to Shanghai, China (PVG) each day, according to promotional banners for United that were shared on Twitter today by LAflyer.

Curious who are @United largest global corporate accounts? @Apple is in the top spot and contributes very much to success of SFO international flying especially the Shanghai service #UnitedAirlines #United #Apple #SFO #PVG #Shanghai #China

Apple is United’s largest global account bringing in $150 million annually. It’s followed by Facebook, Roche, and Google at over $34 million and Deloitte, McKinsey Company, Cisco, Applied Materials, PWC, and Oracle at $12 million to $17 million. Intel, Visa, and Chevron have accounts worth over $10 million annually.

United says that its most important market for Apple is SFO – PVG. That route accounts for $35 million in annual revenue which is around 25% of Apple’s annual spend.

Primary Routes for Apple:
1. PVG (Shanghai, China)
2. HKG (Hong Kong)
3. TPE (Taoyuan, Taiwan)
4. LHR (Heathrow, London)
5. ICN (Incheon, Seoul, South Korea)
6. SIN (Changi, Singapore)
7. MUC (Munich, Germany)
8. HND (Haneda, Tokyo, Japan)
9. PEK (Beijing, China)
10. TLV (Tel Aviv, Israel)

Read More [via Alex]